Structured exercise can help patients with type 1 diabetes (T1D) achieve physical activity targets, however the effects of exercise type on percent time in range (TIR) and glucose variability are unclear. The Type 1 Diabetes Exercise Initiative Pilot Study provided the opportunity to examine glycemic control on structured exercise days compared to sedentary days. Adults with T1D ([mean ± SD] age= 32 ± 14 years; HbA1C= 7.8 ± 1.6%), using a continuous glucose monitor, were assigned to complete twice weekly aerobic, interval or resistance exercise sessions, using study-developed instructional videos for a period of 4 weeks. TIR was higher (Figure 1) and mean glucose concentration was lower overall on exercise days compared with sedentary days (160 ± 52 vs. 176 ± 49 mg/dL, P<0.001). Glucose variability was similar between exercise and sedentary days (coefficient of variation: 36 ± 12% vs. 37% ± 12%).

In summary, participants had lower 24-hour mean glucose levels and a greater percent time in range on active days compared with inactive days.

M. Riddell: Advisory Panel; Self; Xeris Pharmaceuticals, Inc. Research Support; Self; Dexcom, Inc. Speaker's Bureau; Self; Insulet Corporation, Medtronic MiniMed, Inc. Stock/Shareholder; Self; Zucara Therapeutics Inc. Z. Li: None. R. Beck: Other Relationship; Self; Abbott Laboratories, Ascensia Diabetes Care, Bigfoot Biomedical, Dexcom, Inc., Insulet Corporation, Lilly Diabetes, Roche Diabetes Care, Tandem Diabetes Care. R.L. Gal: None. P.G. Jacobs: Stock/Shareholder; Self; Pacific Diabetes Technologies. J.R. Castle: Advisory Panel; Self; Novo Nordisk Inc., Zealand Pharma A/S. Consultant; Self; Dexcom, Inc. Research Support; Self; Dexcom, Inc., Xeris Pharmaceuticals, Inc. M.B. Gillingham: None. M.A. Clements: Advisory Panel; Self; Glooko, Inc. Consultant; Self; Eli Lilly and Company. Speaker's Bureau; Self; Medtronic. S.R. Patton: None. E. Dassau: Consultant; Self; Eli Lilly and Company, Insulet Corporation. Research Support; Self; Dexcom, Inc., DreaMed Diabetes, Ltd., Insulet Corporation, Roche Diabetes Care, Tandem Diabetes Care, Xeris Pharmaceuticals, Inc. Speaker's Bureau; Self; Roche Diabetes Care. Other Relationship; Self; ModAGC. F.J. Doyle: Consultant; Self; ModeAGC. Other Relationship; Self; Insulet Corporation. C.K. Martin: Advisory Panel; Self; EHE. Consultant; Self; ACAP Health, Florida Hospital, WW, Zafgen, Inc. Other Relationship; Self; Academy of Nutrition and Dietetics. P. Calhoun: Stock/Shareholder; Self; Dexcom, Inc. M.R. Rickels: None.


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